Non-cardiac depolarization-blocking drugs are associated with increased risk of out-of-hospital cardiac arrest in the community: non-cardiac depolarization-blocking drugs and OHCA

Depolarization-blocking drugs (DB drugs) used for cardiac disease increase the risk of cardiac arrhythmia (ventricular tachycardia/ventricular fibrillation [VT/VF]) and out-of-hospital cardiac arrest (OHCA) in specific patient groups. However, it is unknown whether drugs for non-cardiac disease that block cardiac depolarization as the off-target effect increase the risk of OHCA on a population level. Therefore, we aimed to investigate OHCA risk of non-cardiac, DB drugs in the community. We conducted a population-based case-control study. We included OHCA cases from an emergency-medical-services-attended OHCA registry in the Netherlands (ARREST:2009–2018), and age/sex/OHCA-date matched non-OHCA controls. We calculated adjusted odds ratios (ORadj) of use of non-cardiac DB drugs for OHCA using conditional logistic regression. Stratified analyses were performed according to first-registered rhythm (VT/VF or nonVT/VF), sex, and age (≤50, 50–70, or ≥70 years). We included 5473 OHCA cases of whom 427 (7.8%) used non-cardiac, DB drugs and 21,866 non-OHCA controls of whom 835 (3.8%) used non-cardiac, DB drugs and found that non-cardiac, DB-drug use was associated with increased OHCA-risk when compared to no use (ORadj1.6[95%-CI:1.4–1.9]). Stratification by first-recorded rhythm revealed that this applied to OHCA with non-VT/VF (asystole) (ORadj2.5[95%-CI:2.1–3.0]) but not with VT/VF (ORadj1.0[95%-CI:0.8–1.2]; p-value interaction < 0.001). The risk was higher in women (ORadj1.8[95%-CI:1.5–2.2] than in men (ORadj1.5[95%-CI:1.2–1.8]; p-value interaction = 0.030) and at younger ages (ORadj≥70yrs1.4[95%-CI:1.2–1.7]; ORadj50–70yrs1.7[95%-CI:1.4–2.1]; ORadj≤50yrs3.2[95%- CI:2.1–5.0]; p-value interaction < 0.001). Use of non-cardiac, DB drugs is associated with increased OHCA risk. This increased risk occurred in patients in whom non-VT/VF was the first-registered rhythm, and it occurred in both sexes but more prominently among women and more strongly in younger patients (≤50 years).